<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        table {
            border: 1px solid gray;
            width: 550px;
        }
        th,td {
            border: 1px solid #000;
            text-align: center;
        }
    </style>
</head>
<body>
    <div id="app">
        <table>
            <caption>欢迎光临_vue开发的收银系统_水果店</caption>
            <thead>
                <tr>
                    <th>苹果 10￥/斤，折扣 &lt;8折&gt; </th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>请输入你要购买的斤数 <input v-model="count" type="number"> </td>
                </tr>
                <tr>
                    <td><button @click="checkout">结账买单~</button></td>
                </tr>
                <tr>
                    <td>结账单：总价：{{ total }}￥元 折后价：{{ (total * .8).toFixed(2) }}￥元 省了：{{ (total * .2).toFixed(2) }}￥元</td>
                </tr>
            </tbody>
        </table>
    </div>

    <script src="./vue.js"></script>
    <script>

        new Vue({
            el: '#app',
            data: {
                count: 0,
                total: 0
            },
            methods: {
                checkout () {
                    // 用输入的数量 * 单价得到总价
                    this.total = this.count * 10
                }
            }
        })
    </script>
</body>
</html>